cable
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When a single-core cable passes through iron plates, will eddy current losses occur if the phases are passed through separately? During construction today, we took into account eddy current losses and decided to pass the three phases through the same hole; however, the client insisted on passing them through separate holes, as it would be difficult for them to shape the 1*240mm2 conductors if they were passed through the same hole. Is it appropriate to wear it this way? I would appreciate it if experts could give me some advice.
Every conductor carrying alternating current generates an alternating magnetic field around it. When such a conductor is inserted into a metal tube or metal plate, the alternating magnetic field generates eddy currents within the walls of the tube, causing the metal tube (plate) to heat up. If the grounding is poor, an induced electric potential will also be generated on the metal tube (plate), posing a risk to operational safety. When the three-phase wires are brought together, the resulting combined alternating magnetic field is approximately equivalent to that produced by a single conductor carrying an equivalent current, where this equivalent current is the vector sum of the three-phase currents. When the three phases are completely symmetric, the vector sum of the three-phase currents is 0. Therefore, three-phase hole penetration (including the neutral wire N) is correct and reasonable.
The owner’s requirements must be met; the iron plates need to be specially treated by being cut apart and joined together with copper welding, so that they do not form a magnetic induction circuit. The owner’s requirements are always correct.
Using a stainless steel plate in the middle solves the problem; there’s no need to cut it open and weld copper together
The logic is correct; the boss is going bankrupt.